package day01;

import java.util.Scanner;
import java.math.BigInteger;

public class Main {
	static long st,et;
	static Scanner sc = new Scanner(System.in);
	
	public static void main(String[] args) 
	{	st =System.currentTimeMillis();
	//程序开始
		BigInteger two = BigInteger.valueOf(2);
		BigInteger a = two.pow(20).subtract(BigInteger.ONE);
		BigInteger b = two.pow(10);
		BigInteger gys= a.gcd(b);
		System.out.println(a.divide(gys)+"/"+b.divide(gys)); 
		
		
	//程序结束
	 et=System.currentTimeMillis();
	 System.out.println();
	 System.out.println(et-st+"ms");
	}
}
